US8982331B2 - Laser rangefinder and condenser lens thereof for receiving a light ray - Google Patents
Laser rangefinder and condenser lens thereof for receiving a light ray Download PDFInfo
- Publication number
- US8982331B2 US8982331B2 US13/866,375 US201313866375A US8982331B2 US 8982331 B2 US8982331 B2 US 8982331B2 US 201313866375 A US201313866375 A US 201313866375A US 8982331 B2 US8982331 B2 US 8982331B2
- Authority
- US
- United States
- Prior art keywords
- lens
- deviation correction
- condenser lens
- light ray
- laser rangefinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related, expires
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Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
- G02B19/0009—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/026—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness by measuring distance between sensor and object
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4816—Constructional features, e.g. arrangements of optical elements of receivers alone
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
- G02B19/0085—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with both a detector and a source
Definitions
- the following generally relates to the field of optics and, more particularly, to a laser rangefinder and a condenser lens thereof for receiving a light ray.
- An optics system of a laser rangefinder includes a laser emitting system and an optical signal receiving system, wherein the optical axes of the laser emitting system and the optical signal receiving system are arranged in parallel with each other and a sensing face of a detecting element 6 is located on the focus of the receiving system as shown in FIG. 1 .
- the laser emitting system collimates laser into a laser beam 1 to illuminate an object surface 2 at an ultra-short distance, and scattered light 3 is converged by a condenser lens 4 into a large spot with the center thereof often deviating far from the focus of the condenser lens 4 , so no signal light can enter the detecting element 6 . Consequently the existing condenser lens 4 usually fails to receive a light ray well, thus preventing a stable light ray input to the detecting element 6 from being developed and thus hindering the range finding capability of the system.
- the following generally describes an a condenser lens suitable for a laser rangefinder for receiving a light ray wherein the condenser lens is capable of effectively receiving scattered light arising from exiting laser incident upon an object at a short distance and converging the scattered light to a detecting element.
- the condenser lens includes a lens body, wherein the lens body is formed or attached with a lens deviation correction area that is located on the light emitting side thereof for correcting focus deviation upon reception of light scattered by an object at a short distance, and the lens center of the lens body is located inside the deviation correction area.
- the deviation correction area includes at least one deviation correction zone for correcting focus deviation in correspondence to close range objects at different distances.
- the invention also provides a laser rangefinder, including an emitting lens and a condenser lens.
- the optical axis of the emitting lens of laser rangefinder may be parallel to but not coincident with that of the lens body wherein the direction of the optical axis passing the focus of the emitting lens and perpendicular to the optical axis of the lens body is a height direction and wherein the direction of the optical axis perpendicular to both the height direction and the direction in which laser exits is a width direction.
- the deviation correction area of lens may thus be arranged at the side of the lens body proximate to the emitting lens and having a size in the height direction smaller than that of the lens body in the height direction.
- the above embodiments have the advantage of providing a condenser lens suitable for a laser rangefinder for receiving a light ray where the condenser lens effectively receives scattered light arising from an exiting laser incident upon a close range object and converges the scattered light to a detecting element.
- FIG. 1 is a schematic principle diagram of an optics system of an existing laser rangefinder
- FIG. 2 is a schematic structural diagram of an exemplary condenser lens constructed according to the description which follows;
- FIG. 3 is a schematic structural diagram of a further exemplary condenser lens constructed according to the description which follows;
- FIG. 4 is a schematic structural diagram of a further exemplary condenser lens constructed according to the description which follows;
- FIG. 5 is a schematic structural diagram of a further exemplary condenser lens constructed according to the description which follows;
- FIG. 6 is a schematic structural diagram of a further exemplary condenser lens constructed according to the description which follows;
- FIG. 7 is a schematic structural diagram of a further exemplary condenser lens constructed according to the description which follows;
- FIG. 8 is a schematic principle diagram illustrating deviation correction according to the description which follows.
- FIG. 9 is a schematic structural diagram of an exemplary optics system of a laser rangefinder according to the description which follows.
- a condenser lens suitable for use with a laser rangefinder and adapted to receive a light ray, generally includes a lens body 7 which can be a generally convex lens and preferably a lens with one face being convex and the other face being flat, where the convex face is non-spherical, i.e., a non-spherical lens.
- the lens body 7 can have a rounded contour or have a part of the rounded count our cut out so that there is a segment of a straight line at the edge of the contour as illustrated in FIGS. 3-7 .
- the lens body 7 is formed therewith a deviation correction area or has the deviation correction area attached thereto.
- the deviation correction area is located on the light emitting side of the lens body 7 to correct for focus deviation upon reception of a laser beam scattered by a close range object.
- the lens center O of the lens body 7 is located inside the deviation correction area of the lens body 7 and includes at least one deviation correction zone 8 for correcting for focus deviation in correspondence to close range objects at different distances.
- the deviation correction zone 8 can be formed of a slot or a protrusion with which the lens body 7 is provided at the emitting side of the lens body 7 . Referring to FIG.
- the slot or the protrusion of which the deviation correction zone 8 is formed is preferably formed with an inclined plane at a non-right angle relative to the optical axis F 1 of the lens body, and in order for a light ray to be converged instead of being diverged, the plane is preferably inclined to converge the light ray toward a detecting element 6 as illustrated in the inclined plane of the deviation correction zone 8 in FIG. 8 .
- the deviation correction area of the lens includes at least one deviation correction zone 8 as illustrated in FIG. 6 and FIG. 7 .
- the deviation correction zone 8 when there is only one deviation correction zone 8 , the deviation correction zone 8 is the entire deviation correction area of lens; and when the number of deviation correction zones 8 is larger than one, that is, there are a plurality of deviation correction zones 8 in the deviation correction area of lens, the different deviation correction zones 8 have their inclined planes for deviation correction formed at different angles relative to the optical axis F 1 of the lens body for the purpose of corresponding deviation correction at different measurement distances.
- the deviation correction zones 8 constitute a nested system in an order of descending sizes so that a smaller deviation correction zone is nested in a larger deviation correction zone.
- the lens center O of the lens body 7 is located inside, or coincides with the edge of, the largest deviation correction zone among the deviation correction area of lens.
- the lens center O as referred to herein refers to the point corresponding to the focus of the lens body 7 projected onto the lens body 7 with the optical axis F 1 of the lens body being a projection line. This has an advantage of ensuring the continuity of measured data because it has been seen that, if the lens center O is located outside of the deviation correction area of lens, then the measured data may fluctuate significantly around this special location of the lens center O without deviation correction for the part of the light ray between the edge of the deviation correction area of lens and the lens center O.
- the deviation correction area of lens has the edge thereof coinciding with the edge of the lens body 7 , and referring to the embodiment as illustrated in FIG. 2 , since the deviation correction zone 8 is the entire deviation correction area of lens, the edge of the deviation correction zone 8 is the edge of the entire deviation correction area of the lens as illustrated in FIG.
- the edge of the deviation correction zone 8 in the lower part of the figure coincides with the edge of the entire lens body 7 , that is, the edge of the lens body 7 is also the edge of the deviation correction area of the lens, where the deviation correction area of the lens has the edge thereof starting with the edge of the lens body 7 for the advantage of enabling the deviation correction area of the lens to cover the zone of the lens body 7 in which the light ray is preferably refracted.
- the deviation correction area of the lens includes a plurality of deviation correction zones 8 in the embodiments as illustrated in FIGS.
- the edge of the largest deviation correction zone coincides with the edge of the lens body 7 or all the deviation correction zones coincide with the edge of the lens body 7 , that is, a larger deviation correction zone completely surrounds a smaller one, or a larger deviation correction zone partially surrounds a smaller one with their edges coinciding.
- a rectangle or another common shape can serve as a general option for the deviation correction zone and the rectangle will have one side thereof changed to an arc when the deviation correction zone 8 coincides with the edge of the lens body 7 .
- the deviation correction zone 8 is shaped as a rectangle or the like, then the length and the width thereof will be unchanged, and since the optical axis of the laser emitting lens is located outside of the lens body 7 instead of coinciding with the optical axis F 1 of the lens body, this will have the measured data that may fluctuate significantly, thus degrading the precision, and thus it is desirable to design the shape of the deviation correction zone 8 so that a further optical axis of the lens away from exiting laser is wider, and since the optical axis is located outside of the lens body 7 , the optical axis further away from the edge of the lens body 7 is narrower.
- the height direction H as referred to herein refers to the direction of exiting the focus of a lens 13 and perpendicular to the optical axis F 1 of the lens body
- the width direction W as referred to herein refers to the direction perpendicular to both the height direction H and the direction in which laser exits, that is, the height direction H depends upon the location of the emitting lens 13 .
- the vertical direction in FIGS. 2-7 and FIG. 9 represents the height direction H
- the horizontal direction therein represents the width direction W.
- the deviation correction area of lens includes at least one compensating deviation correction zone for compensating for measurement over-fluctuation due to the different optical axis F 2 of the laser emitting lens of the laser rangefinder being non-coaxially aligned with the optical axis F 1 of the lens body.
- the compensating deviation correction zone includes a first-class deviation correction zone 9 increasing in width from the edge of the lens body 7 toward the lens center O.
- Two contour lines delimiting the width of the first-class deviation correction zone 9 are referred to as first-class side lines 10 .
- the width as mentioned below refers to the size of the deviation correction zone in the width direction W.
- the first-class deviation correction zone 9 can be shaped like a trapezoid.
- the compensating deviation correction zone includes a second-class deviation correction zone 11 firstly increasingly and then decreasing in width from the edge of the lens body 7 toward the lens center O.
- the second-class deviation correction zone 11 has its contour lines including two second-class side lines 12 delimiting the width thereof.
- the use of the foregoing first-class deviation correction zone 9 can fail to work well with compensation to provide the measured data with good stability in some circumstances.
- the second-class deviation correction zone 11 has been devised so that the width thereof firstly increases and then decreases to better accommodate the Gaussian-beam characteristic of the laser beam to thereby improve the stability of the measured data in such circumstances.
- the second-class deviation correction zone 11 is a symmetrically-mirrored shape, that is, the two second-class side lines 12 can be symmetrically mirrored.
- the second-class side lines 12 can be segments of a curved line, particularly segments of a Gaussian-function curved line, or two intersecting segments of a straight line. In the latter case, as illustrated in FIG. 3 , each of the two segments of straight lines intersect at one end thereof, and the two segments of straight lines have a non-right angle therebetween.
- the second-class side line 12 is divided into two parts of two segments of straight lines intersecting at their ends with the smaller one of their angles being an acute angle.
- the second-class deviation correction zone 11 may not necessarily be symmetrically mirrored in order to provide compensation, but alternatively respective ones of the two second-class side lines 12 can be a segment of curved line and two straight lines or the two second-class side lines 12 can be a combination of a segment of curved line and a straight line as long as the second-class deviation correction zone 11 firstly increases and then decreases in width.
- the width of the-class deviation correction zone 11 proximate to the lens center O shall be larger than the width thereof proximity the edge despite such a width firstly increasing and then decreasing from the edge toward the lens center O.
- two deviation correction zones 8 are set for different distances so that the larger one is a compensating deviation correction zone with the other deviation correction zone located inside thereof, and since the smaller deviation correction zone compensates for the object 2 at a very short distance, the effect of the Gaussian-beam characteristic may not be very obvious, and this deviation correction zone 8 may not be implemented as a compensating deviation correction zone in view of the size and manufacturing thereof, and the compensating deviation correction zone can be either the first-class deviation correction zone 9 or the second-class deviation correction zone 11 , the latter of which is adopted in both FIG. 6 and FIG. 7 for better stability.
- a laser rangefinder includes the emitting lens 13 and the inventive condenser lens 4 , where the focal axis of the emitting lens 13 is parallel to but does not coincides with the optical axis F 1 of the lens body, the direction passing the focus of the emitting lens and perpendicular to the optical axis F 1 of the lens body is the height direction H, the direction perpendicular to both the height direction H and the direction in which laser exits is the width direction W, and the deviation correction area of lens is arranged at the side of the lens body 7 proximate to the emitting lens 13 and has a smaller size in the height direction H than the size of the lens body 7 in the height direction H.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Optics & Photonics (AREA)
- Optical Radar Systems And Details Thereof (AREA)
- Measurement Of Optical Distance (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201210118988.2A CN102645738B (zh) | 2012-04-23 | 2012-04-23 | 激光测距仪及适用其接收光线的聚光镜 |
CN201210118988.2 | 2012-04-23 | ||
CN201210118988 | 2012-04-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20130278916A1 US20130278916A1 (en) | 2013-10-24 |
US8982331B2 true US8982331B2 (en) | 2015-03-17 |
Family
ID=46658657
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/866,375 Expired - Fee Related US8982331B2 (en) | 2012-04-23 | 2013-04-19 | Laser rangefinder and condenser lens thereof for receiving a light ray |
Country Status (3)
Country | Link |
---|---|
US (1) | US8982331B2 (zh) |
CN (1) | CN102645738B (zh) |
DE (1) | DE202013101677U1 (zh) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104457689B (zh) * | 2013-09-25 | 2017-06-20 | 北京航天计量测试技术研究所 | 一种用于近距离激光测距仪的光学接发结构 |
CN105627857B (zh) * | 2014-11-04 | 2018-08-07 | 南京德朔实业有限公司 | 卷尺 |
CN113030910A (zh) * | 2019-12-09 | 2021-06-25 | 觉芯电子(无锡)有限公司 | 一种激光雷达系统 |
CN112987018B (zh) * | 2021-02-08 | 2023-06-13 | 中国科学院光电技术研究所 | 利用平面微纳结构透镜实现大凝视视场探测的激光成像光学系统 |
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US4907026A (en) * | 1986-04-21 | 1990-03-06 | Canon Kabushiki Kaisha | Light projection system for automatic focus detection |
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DE4316348A1 (de) * | 1993-05-15 | 1994-11-17 | Wild Heerbrugg Ag | Vorrichtung zur Distanzmessung |
JPH11133152A (ja) * | 1997-10-31 | 1999-05-21 | Yaskawa Electric Corp | 光距離計測装置 |
DE19860464C2 (de) * | 1998-12-28 | 2001-02-01 | Jenoptik Jena Gmbh | Laserentfernungsmeßgerät für große Meßbereiche |
CN2750334Y (zh) * | 2004-11-30 | 2006-01-04 | 孙正生 | 凸透镜分解聚光器 |
CN2811945Y (zh) * | 2005-08-08 | 2006-08-30 | 南京德朔实业有限公司 | 光学测距装置 |
CN1912648B (zh) * | 2005-08-10 | 2011-07-27 | 亚洲光学股份有限公司 | 激光尺光学系统 |
CN102313882B (zh) * | 2011-07-22 | 2015-07-29 | 江苏徕兹光电科技有限公司 | 激光测距仪的光学系统结构 |
CN202563153U (zh) * | 2012-04-23 | 2012-11-28 | 南京德朔实业有限公司 | 激光测距仪及适用其接收光线的聚光镜 |
-
2012
- 2012-04-23 CN CN201210118988.2A patent/CN102645738B/zh not_active Expired - Fee Related
-
2013
- 2013-04-19 US US13/866,375 patent/US8982331B2/en not_active Expired - Fee Related
- 2013-04-19 DE DE202013101677U patent/DE202013101677U1/de not_active Expired - Lifetime
Patent Citations (10)
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US4513378A (en) * | 1981-10-20 | 1985-04-23 | Antkowiak Edward T | High-accuracy navigating apparatus with step-driven projected chart |
US4511232A (en) * | 1982-05-28 | 1985-04-16 | Canon Kabushiki Kaisha | Auto-focus camera |
US5266791A (en) * | 1991-10-17 | 1993-11-30 | Fuji Photo Optical Co., Ltd. | Autofocus binocular stereomicroscope |
US5422699A (en) * | 1992-01-31 | 1995-06-06 | Nikon Corporation | Photographic camera with variable focal length |
US5923909A (en) * | 1995-11-02 | 1999-07-13 | Minolta Co., Ltd. | Distance measuring device and a camera using the same |
US6322192B1 (en) * | 1997-06-30 | 2001-11-27 | Hewlett-Packard Company | Multi-function optical sensing system for inkjet printing |
US20100110548A1 (en) * | 2008-02-06 | 2010-05-06 | Tsuguhiro Korenaga | Diffractive optical element and method of making the same |
US20110298888A1 (en) * | 2009-02-27 | 2011-12-08 | Sony Corporation | Image capturing apparatus and image capturing method |
US20120050577A1 (en) * | 2010-08-30 | 2012-03-01 | Canon Kabushiki Kaisha | Lens driving apparatus and control method thereof, and image capturing apparatus and control method thereof |
US20120182462A1 (en) * | 2011-01-19 | 2012-07-19 | Samsung Electronics Co., Ltd. | Auto-focusing apparatus |
Also Published As
Publication number | Publication date |
---|---|
US20130278916A1 (en) | 2013-10-24 |
CN102645738B (zh) | 2014-07-30 |
DE202013101677U1 (de) | 2013-07-24 |
CN102645738A (zh) | 2012-08-22 |
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